<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告提示区域 -->
      <el-alert title="添加商品信息"
                show-icon
                center
                :closable="false"
                type="info">
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200"
                :active="activeIndex - 0"
                align-center
                finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏标签页 -->
      <el-form :model="addForm"
               :rules="FormRules"
               ref="addFormRef"
               label-width="100px"
               label-position="top">
        <el-tabs :tab-position="'left'"
                 v-model="activeIndex"
                 :before-leave="beforeTabLeave"
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息"
                       name="0">
            <el-form-item label="商品名称"
                          prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格"
                          prop="goods_price">
              <el-input v-model="addForm.goods_price"
                        type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量"
                          prop="goods_weight">
              <el-input v-model="addForm.goods_weight"
                        type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量"
                          prop="goods_number">
              <el-input v-model="addForm.goods_number"
                        type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类"
                          prop="goods_cat">
              <!-- 商品分类级联选择器 -->
              <el-cascader v-model="addForm.goods_cat"
                           :options="cateList"
                           :props="cascaderProps"
                           @change="handleChange"
                           clearable></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数"
                       name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item v-for="item in manyTableData"
                          :key="item.attr_id"
                          :label="item.attr_name">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox v-for="(cb, i) in item.attr_vals"
                             :key="i"
                             border
                             :label="cb"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性"
                       name="2">
            <el-form-item v-for="item in onlyTableData"
                          :key="item.attr_id"
                          :label="item.attr_name">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片"
                       name="3">
            <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload :action="uploadURL"
                       :headers="headersObj"
                       :on-preview="handlePreview"
                       :on-remove="handleRemove"
                       :on-success="handleSuccess"
                       list-type="picture">
              <el-button size="small"
                         type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容"
                       name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary"
                       class="addBtn"
                       @click="addGoods">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览"
               :visible.sync="previewVisible"
               width="28%">
      <img :src="previewPath"
           alt=""
           class="previewImg">
    </el-dialog>
  </div>
</template>


<script>
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情介绍
        goods_introduce: '',
        attrs: []
      },
      FormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ], goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ], goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ], goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ], goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类数据列表
      cateList: [],
      // 级联选择器的配置对象
      cascaderProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的header的请求头对象
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      // 控制图片预览对话框的显示与隐藏
      previewVisible: false

    }
  },
  created() {
    this.getGoodsCateList()
  },
  methods: {
    async getGoodsCateList() {
      const { data: res } = await this.$http.get('categories', { type: 3 })
      if (res.meta.status != 200) {
        return this.$message.error('获取商品分类数据失败！')
      }
      console.log(res)
      this.cateList = res.data
    },
    // 级联选择器选中项发生变化，会触发这个函数
    handleChange() {
      // 选中的分类不是三级分类---清空数据列表
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 是否切换标签页
    beforeTabLeave(activeName, oldActiveName) {
      // console.log('即将离开的标签页名字是：' + oldActiveName)
      // console.log('即将进入的标签页名字是：' + activeName)
      // return false  阻止切换标签页

      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类！')
        return false
      }
    },
    // 点击 Tab时，触发点击事件
    async tabClicked() {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })

        if (res.meta.status != 200) {
          return this.$message.error('获取动态参数列表失败！')
        }
        console.log(res)

        res.data.forEach(item => {
          // 三元表达式判断length === 3，则用split分割字符串，否则返回一个空数组给item.attr_vals
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        });
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })

        if (res.meta.status != 200) {
          return this.$message.error('获取静态属性列表失败！')
        }
        console.log(res)

        res.data.forEach(item => {
          // 三元表达式判断length === 3，则用split分割字符串，否则返回一个空数组给item.attr_vals
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        });
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 1、获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2、从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3、调用数组的 splice 方法，把图片信息对象，从pics 数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)

    },
    // 监听图片上传成功时的事件
    handleSuccess(response) {
      console.log(response)
      // 1、拼接得到一个图片信息对象
      const pinInfo = { pic: response.data.tmp_path }
      // 2、将图片信息对象，push到pics数组中
      this.addForm.pics.push(pinInfo)
      console.log(this.addForm)
    },
    // 添加商品
    addGoods() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          this.$message.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // lodash     cloneDeep(obj) 进行深拷贝
        // form 和 addForm(只共给级联选择器使用) 是两个完全不相干的对象
        // 对form进行操作  不会对addForm有任何影响
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)

        // 发起请求添加商品的网络请求
        // 商品的名称，必须是唯一
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status != 201) {
          this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
};
</script>

<style lang='less' scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.addBtn {
  margin-top: 15px;
}
</style>
